From 85d9ca9ad2879d6575caedc2d304a9d5e38de6c3 Mon Sep 17 00:00:00 2001
From: Lachlan Sneff <lachlan.sneff@gmail.com>
Date: Mon, 22 Apr 2019 10:35:55 -0700
Subject: [PATCH 1/7] Add NativeWasmType trait and modify WasmExternType

---
 lib/runtime-core/src/typed_func.rs |  46 ++++-----
 lib/runtime-core/src/types.rs      | 150 +++++++++++++++++++----------
 2 files changed, 116 insertions(+), 80 deletions(-)

diff --git a/lib/runtime-core/src/typed_func.rs b/lib/runtime-core/src/typed_func.rs
index 59c610773..5f14a8fa1 100644
--- a/lib/runtime-core/src/typed_func.rs
+++ b/lib/runtime-core/src/typed_func.rs
@@ -2,7 +2,7 @@ use crate::{
     error::RuntimeError,
     export::{Context, Export, FuncPointer},
     import::IsExport,
-    types::{FuncSig, Type, WasmExternType},
+    types::{FuncSig, NativeWasmType, Type, WasmExternType},
     vm::{self, Ctx},
 };
 use std::{
@@ -135,10 +135,10 @@ where
 impl<Rets, E> TrapEarly<Rets> for Result<Rets, E>
 where
     Rets: WasmTypeList,
-    E: Any,
+    E: Into<Box<Any>> + 'static,
 {
     fn report(self) -> Result<Rets, Box<dyn Any>> {
-        self.map_err(|err| Box::new(err) as Box<dyn Any>)
+        self.map_err(|err| err.into())
     }
 }
 
@@ -213,22 +213,24 @@ impl<A: WasmExternType> WasmTypeList for (A,) {
     type CStruct = S1<A>;
     type RetArray = [u64; 1];
     fn from_ret_array(array: Self::RetArray) -> Self {
-        (WasmExternType::from_bits(array[0]),)
+        (WasmExternType::from_native(NativeWasmType::from_bits(
+            array[0],
+        )),)
     }
     fn empty_ret_array() -> Self::RetArray {
         [0u64]
     }
     fn from_c_struct(c_struct: Self::CStruct) -> Self {
         let S1(a) = c_struct;
-        (a,)
+        (WasmExternType::from_native(a),)
     }
     fn into_c_struct(self) -> Self::CStruct {
         #[allow(unused_parens, non_snake_case)]
         let (a,) = self;
-        S1(a)
+        S1(WasmExternType::to_native(a))
     }
     fn types() -> &'static [Type] {
-        &[A::TYPE]
+        &[A::Native::TYPE]
     }
     #[allow(non_snake_case)]
     unsafe fn call<Rets: WasmTypeList>(
@@ -237,11 +239,8 @@ impl<A: WasmExternType> WasmTypeList for (A,) {
         wasm: Wasm,
         ctx: *mut Ctx,
     ) -> Result<Rets, WasmTrapInfo> {
-        // type Trampoline = extern "C" fn(*mut Ctx, *const c_void, *const u64, *mut u64);
-        // type Invoke = extern "C" fn(Trampoline, *mut Ctx, *const c_void, *const u64, *mut u64, &mut WasmTrapInfo) -> bool;
-
         let (a,) = self;
-        let args = [a.to_bits()];
+        let args = [a.to_native().to_bits()];
         let mut rets = Rets::empty_ret_array();
         let mut trap = WasmTrapInfo::Unknown;
 
@@ -277,7 +276,7 @@ where
 macro_rules! impl_traits {
     ( [$repr:ident] $struct_name:ident, $( $x:ident ),* ) => {
         #[repr($repr)]
-        pub struct $struct_name <$( $x ),*> ( $( $x ),* );
+        pub struct $struct_name <$( $x: WasmExternType ),*> ( $( <$x as WasmExternType>::Native ),* );
 
         impl< $( $x: WasmExternType, )* > WasmTypeList for ( $( $x ),* ) {
             type CStruct = $struct_name<$( $x ),*>;
@@ -285,7 +284,7 @@ macro_rules! impl_traits {
             fn from_ret_array(array: Self::RetArray) -> Self {
                 #[allow(non_snake_case)]
                 let [ $( $x ),* ] = array;
-                ( $( WasmExternType::from_bits($x) ),* )
+                ( $( WasmExternType::from_native(NativeWasmType::from_bits($x)) ),* )
             }
             fn empty_ret_array() -> Self::RetArray {
                 [0; count_idents!( $( $x ),* )]
@@ -293,24 +292,21 @@ macro_rules! impl_traits {
             fn from_c_struct(c_struct: Self::CStruct) -> Self {
                 #[allow(non_snake_case)]
                 let $struct_name ( $( $x ),* ) = c_struct;
-                ( $( $x ),* )
+                ( $( WasmExternType::from_native($x) ),* )
             }
             fn into_c_struct(self) -> Self::CStruct {
                 #[allow(unused_parens, non_snake_case)]
                 let ( $( $x ),* ) = self;
-                $struct_name ( $( $x ),* )
+                $struct_name ( $( WasmExternType::to_native($x) ),* )
             }
             fn types() -> &'static [Type] {
-                &[$( $x::TYPE, )*]
+                &[$( $x::Native::TYPE, )*]
             }
             #[allow(non_snake_case)]
             unsafe fn call<Rets: WasmTypeList>(self, f: NonNull<vm::Func>, wasm: Wasm, ctx: *mut Ctx) -> Result<Rets, WasmTrapInfo> {
-                // type Trampoline = extern "C" fn(*mut Ctx, *const c_void, *const u64, *mut u64);
-                // type Invoke = extern "C" fn(Trampoline, *mut Ctx, *const c_void, *const u64, *mut u64, &mut WasmTrapInfo) -> bool;
-
                 #[allow(unused_parens)]
                 let ( $( $x ),* ) = self;
-                let args = [ $( $x.to_bits() ),* ];
+                let args = [ $( $x.to_native().to_bits() ),* ];
                 let mut rets = Rets::empty_ret_array();
                 let mut trap = WasmTrapInfo::Unknown;
 
@@ -319,12 +315,6 @@ macro_rules! impl_traits {
                 } else {
                     Err(trap)
                 }
-
-                // let f: extern fn(*mut Ctx $( ,$x )*) -> Rets::CStruct = mem::transmute(f);
-                // #[allow(unused_parens)]
-                // let ( $( $x ),* ) = self;
-                // let c_struct = f(ctx $( ,$x )*);
-                // Rets::from_c_struct(c_struct)
             }
         }
 
@@ -335,11 +325,11 @@ macro_rules! impl_traits {
 
                 /// This is required for the llvm backend to be able to unwind through this function.
                 #[cfg_attr(nightly, unwind(allowed))]
-                extern fn wrap<$( $x: WasmExternType, )* Rets: WasmTypeList, Trap: TrapEarly<Rets>, FN: Fn( &mut Ctx $( ,$x )* ) -> Trap>( ctx: &mut Ctx $( ,$x: $x )* ) -> Rets::CStruct {
+                extern fn wrap<$( $x: WasmExternType, )* Rets: WasmTypeList, Trap: TrapEarly<Rets>, FN: Fn( &mut Ctx $( ,$x )* ) -> Trap>( ctx: &mut Ctx $( ,$x: <$x as WasmExternType>::Native )* ) -> Rets::CStruct {
                     let f: FN = unsafe { mem::transmute_copy(&()) };
 
                     let err = match panic::catch_unwind(panic::AssertUnwindSafe(|| {
-                        let res = f( ctx $( ,$x )* ).report();
+                        let res = f( ctx $( ,WasmExternType::from_native($x) )* ).report();
                         res
                     })) {
                         Ok(Ok(returns)) => return returns.into_c_struct(),
diff --git a/lib/runtime-core/src/types.rs b/lib/runtime-core/src/types.rs
index 79ef5da7f..bf5df2183 100644
--- a/lib/runtime-core/src/types.rs
+++ b/lib/runtime-core/src/types.rs
@@ -71,103 +71,149 @@ impl From<f64> for Value {
     }
 }
 
-pub unsafe trait WasmExternType: Copy + Clone
+pub unsafe trait NativeWasmType: Copy + Into<Value>
 where
     Self: Sized,
 {
     const TYPE: Type;
+    fn from_bits(bits: u64) -> Self;
     fn to_bits(self) -> u64;
-    fn from_bits(n: u64) -> Self;
+}
+
+unsafe impl NativeWasmType for i32 {
+    const TYPE: Type = Type::I32;
+    fn from_bits(bits: u64) -> Self {
+        bits as _
+    }
+    fn to_bits(self) -> u64 {
+        self as _
+    }
+}
+unsafe impl NativeWasmType for i64 {
+    const TYPE: Type = Type::I64;
+    fn from_bits(bits: u64) -> Self {
+        bits as _
+    }
+    fn to_bits(self) -> u64 {
+        self as _
+    }
+}
+unsafe impl NativeWasmType for f32 {
+    const TYPE: Type = Type::F32;
+    fn from_bits(bits: u64) -> Self {
+        bits as _
+    }
+    fn to_bits(self) -> u64 {
+        self as _
+    }
+}
+unsafe impl NativeWasmType for f64 {
+    const TYPE: Type = Type::F64;
+    fn from_bits(bits: u64) -> Self {
+        bits as _
+    }
+    fn to_bits(self) -> u64 {
+        self as _
+    }
+}
+
+pub unsafe trait WasmExternType: Copy
+where
+    Self: Sized,
+{
+    type Native: NativeWasmType;
+    fn from_native(native: Self::Native) -> Self;
+    fn to_native(self) -> Self::Native;
 }
 
 unsafe impl WasmExternType for i8 {
-    const TYPE: Type = Type::I32;
-    fn to_bits(self) -> u64 {
-        self as u64
+    type Native = i32;
+    fn from_native(native: Self::Native) -> Self {
+        native as _
     }
-    fn from_bits(n: u64) -> Self {
-        n as _
+    fn to_native(self) -> Self::Native {
+        self as _
     }
 }
 unsafe impl WasmExternType for u8 {
-    const TYPE: Type = Type::I32;
-    fn to_bits(self) -> u64 {
-        self as u64
+    type Native = i32;
+    fn from_native(native: Self::Native) -> Self {
+        native as _
     }
-    fn from_bits(n: u64) -> Self {
-        n as _
+    fn to_native(self) -> Self::Native {
+        self as _
     }
 }
 unsafe impl WasmExternType for i16 {
-    const TYPE: Type = Type::I32;
-    fn to_bits(self) -> u64 {
-        self as u64
+    type Native = i32;
+    fn from_native(native: Self::Native) -> Self {
+        native as _
     }
-    fn from_bits(n: u64) -> Self {
-        n as _
+    fn to_native(self) -> Self::Native {
+        self as _
     }
 }
 unsafe impl WasmExternType for u16 {
-    const TYPE: Type = Type::I32;
-    fn to_bits(self) -> u64 {
-        self as u64
+    type Native = i32;
+    fn from_native(native: Self::Native) -> Self {
+        native as _
     }
-    fn from_bits(n: u64) -> Self {
-        n as _
+    fn to_native(self) -> Self::Native {
+        self as _
     }
 }
 unsafe impl WasmExternType for i32 {
-    const TYPE: Type = Type::I32;
-    fn to_bits(self) -> u64 {
-        self as u64
+    type Native = i32;
+    fn from_native(native: Self::Native) -> Self {
+        native
     }
-    fn from_bits(n: u64) -> Self {
-        n as _
+    fn to_native(self) -> Self::Native {
+        self
     }
 }
 unsafe impl WasmExternType for u32 {
-    const TYPE: Type = Type::I32;
-    fn to_bits(self) -> u64 {
-        self as u64
+    type Native = i32;
+    fn from_native(native: Self::Native) -> Self {
+        native as _
     }
-    fn from_bits(n: u64) -> Self {
-        n as _
+    fn to_native(self) -> Self::Native {
+        self as _
     }
 }
 unsafe impl WasmExternType for i64 {
-    const TYPE: Type = Type::I64;
-    fn to_bits(self) -> u64 {
-        self as u64
+    type Native = i64;
+    fn from_native(native: Self::Native) -> Self {
+        native
     }
-    fn from_bits(n: u64) -> Self {
-        n as _
+    fn to_native(self) -> Self::Native {
+        self
     }
 }
 unsafe impl WasmExternType for u64 {
-    const TYPE: Type = Type::I64;
-    fn to_bits(self) -> u64 {
-        self
+    type Native = i64;
+    fn from_native(native: Self::Native) -> Self {
+        native as _
     }
-    fn from_bits(n: u64) -> Self {
-        n
+    fn to_native(self) -> Self::Native {
+        self as _
     }
 }
 unsafe impl WasmExternType for f32 {
-    const TYPE: Type = Type::F32;
-    fn to_bits(self) -> u64 {
-        self.to_bits() as u64
+    type Native = f32;
+    fn from_native(native: Self::Native) -> Self {
+        native
     }
-    fn from_bits(n: u64) -> Self {
-        f32::from_bits(n as u32)
+    fn to_native(self) -> Self::Native {
+        self
     }
 }
 unsafe impl WasmExternType for f64 {
-    const TYPE: Type = Type::F64;
-    fn to_bits(self) -> u64 {
-        self.to_bits()
+    type Native = f64;
+    fn from_native(native: Self::Native) -> Self {
+        native
     }
-    fn from_bits(n: u64) -> Self {
-        f64::from_bits(n)
+    fn to_native(self) -> Self::Native {
+        self
     }
 }
 

From 74b6ba4eaf307091e34c957ede66b1579e180378 Mon Sep 17 00:00:00 2001
From: Lachlan Sneff <lachlan.sneff@gmail.com>
Date: Mon, 22 Apr 2019 11:42:52 -0700
Subject: [PATCH 2/7] Return type normalization, and change return errors from
 imported functions

---
 lib/clif-backend/src/signal/unix.rs |   2 +-
 lib/emscripten/src/varargs.rs       |  13 +--
 lib/runtime-core/src/error.rs       |  10 +-
 lib/runtime-core/src/typed_func.rs  |  22 ++--
 lib/wasi/src/lib.rs                 |   6 ++
 lib/wasi/src/ptr.rs                 |  10 +-
 lib/wasi/src/syscalls/mod.rs        |   5 +-
 lib/wasi/src/syscalls/types.rs      | 156 ++++++++++++++--------------
 8 files changed, 115 insertions(+), 109 deletions(-)

diff --git a/lib/clif-backend/src/signal/unix.rs b/lib/clif-backend/src/signal/unix.rs
index feaf4e2e2..3e57a1588 100644
--- a/lib/clif-backend/src/signal/unix.rs
+++ b/lib/clif-backend/src/signal/unix.rs
@@ -76,7 +76,7 @@ pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> R
             *jmp_buf = prev_jmp_buf;
 
             if let Some(data) = super::TRAP_EARLY_DATA.with(|cell| cell.replace(None)) {
-                Err(RuntimeError::Panic { data })
+                Err(RuntimeError::Error { data })
             } else {
                 let (faulting_addr, inst_ptr) = CAUGHT_ADDRESSES.with(|cell| cell.get());
 
diff --git a/lib/emscripten/src/varargs.rs b/lib/emscripten/src/varargs.rs
index 3775d102c..a6a1fe46b 100644
--- a/lib/emscripten/src/varargs.rs
+++ b/lib/emscripten/src/varargs.rs
@@ -1,8 +1,5 @@
 use std::mem;
-use wasmer_runtime_core::{
-    types::{Type, WasmExternType},
-    vm::Ctx,
-};
+use wasmer_runtime_core::{types::WasmExternType, vm::Ctx};
 
 #[repr(transparent)]
 #[derive(Copy, Clone)]
@@ -19,12 +16,12 @@ impl VarArgs {
 }
 
 unsafe impl WasmExternType for VarArgs {
-    const TYPE: Type = Type::I32;
+    type Native = i32;
 
-    fn to_bits(self) -> u64 {
-        self.pointer as u64
+    fn to_native(self) -> Self::Native {
+        self.pointer as _
     }
-    fn from_bits(n: u64) -> Self {
+    fn from_native(n: Self::Native) -> Self {
         Self { pointer: n as u32 }
     }
 }
diff --git a/lib/runtime-core/src/error.rs b/lib/runtime-core/src/error.rs
index 090214834..84ea04bc2 100644
--- a/lib/runtime-core/src/error.rs
+++ b/lib/runtime-core/src/error.rs
@@ -1,4 +1,4 @@
-use crate::types::{FuncSig, GlobalDescriptor, MemoryDescriptor, TableDescriptor, Type, Value};
+use crate::types::{FuncSig, GlobalDescriptor, MemoryDescriptor, TableDescriptor, Type};
 use core::borrow::Borrow;
 use std::any::Any;
 
@@ -121,8 +121,7 @@ impl std::error::Error for LinkError {}
 /// Comparing two `RuntimeError`s always evaluates to false.
 pub enum RuntimeError {
     Trap { msg: Box<str> },
-    Exception { data: Box<[Value]> },
-    Panic { data: Box<dyn Any> },
+    Error { data: Box<dyn Any> },
 }
 
 impl PartialEq for RuntimeError {
@@ -137,10 +136,7 @@ impl std::fmt::Display for RuntimeError {
             RuntimeError::Trap { ref msg } => {
                 write!(f, "WebAssembly trap occured during runtime: {}", msg)
             }
-            RuntimeError::Exception { ref data } => {
-                write!(f, "Uncaught WebAssembly exception: {:?}", data)
-            }
-            RuntimeError::Panic { data } => {
+            RuntimeError::Error { data } => {
                 let msg = if let Some(s) = data.downcast_ref::<String>() {
                     s
                 } else if let Some(s) = data.downcast_ref::<&str>() {
diff --git a/lib/runtime-core/src/typed_func.rs b/lib/runtime-core/src/typed_func.rs
index 5f14a8fa1..ef1b3c077 100644
--- a/lib/runtime-core/src/typed_func.rs
+++ b/lib/runtime-core/src/typed_func.rs
@@ -7,6 +7,7 @@ use crate::{
 };
 use std::{
     any::Any,
+    convert::Infallible,
     ffi::c_void,
     fmt,
     marker::PhantomData,
@@ -120,14 +121,16 @@ pub trait TrapEarly<Rets>
 where
     Rets: WasmTypeList,
 {
-    fn report(self) -> Result<Rets, Box<dyn Any>>;
+    type Error: 'static;
+    fn report(self) -> Result<Rets, Self::Error>;
 }
 
 impl<Rets> TrapEarly<Rets> for Rets
 where
     Rets: WasmTypeList,
 {
-    fn report(self) -> Result<Rets, Box<dyn Any>> {
+    type Error = Infallible;
+    fn report(self) -> Result<Rets, Infallible> {
         Ok(self)
     }
 }
@@ -135,10 +138,11 @@ where
 impl<Rets, E> TrapEarly<Rets> for Result<Rets, E>
 where
     Rets: WasmTypeList,
-    E: Into<Box<Any>> + 'static,
+    E: 'static,
 {
-    fn report(self) -> Result<Rets, Box<dyn Any>> {
-        self.map_err(|err| err.into())
+    type Error = E;
+    fn report(self) -> Result<Rets, E> {
+        self
     }
 }
 
@@ -329,11 +333,13 @@ macro_rules! impl_traits {
                     let f: FN = unsafe { mem::transmute_copy(&()) };
 
                     let err = match panic::catch_unwind(panic::AssertUnwindSafe(|| {
-                        let res = f( ctx $( ,WasmExternType::from_native($x) )* ).report();
-                        res
+                        f( ctx $( ,WasmExternType::from_native($x) )* ).report()
                     })) {
                         Ok(Ok(returns)) => return returns.into_c_struct(),
-                        Ok(Err(err)) => err,
+                        Ok(Err(err)) => {
+                            let b: Box<_> = err.into();
+                            b as Box<dyn Any>
+                        },
                         Err(err) => err,
                     };
 
diff --git a/lib/wasi/src/lib.rs b/lib/wasi/src/lib.rs
index c08428dbe..82de5ad1f 100644
--- a/lib/wasi/src/lib.rs
+++ b/lib/wasi/src/lib.rs
@@ -17,6 +17,12 @@ pub use self::utils::is_wasi_module;
 
 use wasmer_runtime_core::{func, import::ImportObject, imports};
 
+/// This is returned in the Box<dyn Any> RuntimeError::Error variant.
+/// Use `downcast` or `downcast_ref` to retrieve the `ExitCode`.
+pub struct ExitCode {
+    pub code: syscalls::types::__wasi_exitcode_t,
+}
+
 pub fn generate_import_object(
     args: Vec<Vec<u8>>,
     envs: Vec<Vec<u8>>,
diff --git a/lib/wasi/src/ptr.rs b/lib/wasi/src/ptr.rs
index 85a582df0..55a16d40c 100644
--- a/lib/wasi/src/ptr.rs
+++ b/lib/wasi/src/ptr.rs
@@ -2,7 +2,7 @@ use crate::syscalls::types::{__wasi_errno_t, __WASI_EFAULT};
 use std::{cell::Cell, fmt, marker::PhantomData, mem};
 use wasmer_runtime_core::{
     memory::Memory,
-    types::{Type, ValueType, WasmExternType},
+    types::{ValueType, WasmExternType},
 };
 
 pub struct Array;
@@ -73,12 +73,12 @@ impl<T: Copy + ValueType> WasmPtr<T, Array> {
 }
 
 unsafe impl<T: Copy, Ty> WasmExternType for WasmPtr<T, Ty> {
-    const TYPE: Type = Type::I32;
+    type Native = i32;
 
-    fn to_bits(self) -> u64 {
-        self.offset as u64
+    fn to_native(self) -> Self::Native {
+        self.offset as i32
     }
-    fn from_bits(n: u64) -> Self {
+    fn from_native(n: Self::Native) -> Self {
         Self {
             offset: n as u32,
             _phantom: PhantomData,
diff --git a/lib/wasi/src/syscalls/mod.rs b/lib/wasi/src/syscalls/mod.rs
index a436444fb..ba9d66b5d 100644
--- a/lib/wasi/src/syscalls/mod.rs
+++ b/lib/wasi/src/syscalls/mod.rs
@@ -9,6 +9,7 @@ use self::types::*;
 use crate::{
     ptr::{Array, WasmPtr},
     state::{Fd, InodeVal, Kind, WasiFile, WasiState, MAX_SYMLINKS},
+    ExitCode,
 };
 use rand::{thread_rng, Rng};
 use std::cell::Cell;
@@ -1430,9 +1431,9 @@ pub fn poll_oneoff(
     debug!("wasi::poll_oneoff");
     unimplemented!()
 }
-pub fn proc_exit(ctx: &mut Ctx, rval: __wasi_exitcode_t) -> Result<(), &'static str> {
+pub fn proc_exit(ctx: &mut Ctx, code: __wasi_exitcode_t) -> Result<(), ExitCode> {
     debug!("wasi::proc_exit, {}", rval);
-    Err("Instance exited")
+    Err(ExitCode { code })
 }
 pub fn proc_raise(ctx: &mut Ctx, sig: __wasi_signal_t) -> __wasi_errno_t {
     debug!("wasi::proc_raise");
diff --git a/lib/wasi/src/syscalls/types.rs b/lib/wasi/src/syscalls/types.rs
index c030df312..c239031a4 100644
--- a/lib/wasi/src/syscalls/types.rs
+++ b/lib/wasi/src/syscalls/types.rs
@@ -43,84 +43,84 @@ pub struct __wasi_dirent_t {
     pub d_type: __wasi_filetype_t,
 }
 
-pub type __wasi_errno_t = u32;
-pub const __WASI_ESUCCESS: u32 = 0;
-pub const __WASI_E2BIG: u32 = 1;
-pub const __WASI_EACCES: u32 = 2;
-pub const __WASI_EADDRINUSE: u32 = 3;
-pub const __WASI_EADDRNOTAVAIL: u32 = 4;
-pub const __WASI_EAFNOSUPPORT: u32 = 5;
-pub const __WASI_EAGAIN: u32 = 6;
-pub const __WASI_EALREADY: u32 = 7;
-pub const __WASI_EBADF: u32 = 8;
-pub const __WASI_EBADMSG: u32 = 9;
-pub const __WASI_EBUSY: u32 = 10;
-pub const __WASI_ECANCELED: u32 = 11;
-pub const __WASI_ECHILD: u32 = 12;
-pub const __WASI_ECONNABORTED: u32 = 13;
-pub const __WASI_ECONNREFUSED: u32 = 14;
-pub const __WASI_ECONNRESET: u32 = 15;
-pub const __WASI_EDEADLK: u32 = 16;
-pub const __WASI_EDESTADDRREQ: u32 = 17;
-pub const __WASI_EDOM: u32 = 18;
-pub const __WASI_EDQUOT: u32 = 19;
-pub const __WASI_EEXIST: u32 = 20;
-pub const __WASI_EFAULT: u32 = 21;
-pub const __WASI_EFBIG: u32 = 22;
-pub const __WASI_EHOSTUNREACH: u32 = 23;
-pub const __WASI_EIDRM: u32 = 24;
-pub const __WASI_EILSEQ: u32 = 25;
-pub const __WASI_EINPROGRESS: u32 = 26;
-pub const __WASI_EINTR: u32 = 27;
-pub const __WASI_EINVAL: u32 = 28;
-pub const __WASI_EIO: u32 = 29;
-pub const __WASI_EISCONN: u32 = 30;
-pub const __WASI_EISDIR: u32 = 31;
-pub const __WASI_ELOOP: u32 = 32;
-pub const __WASI_EMFILE: u32 = 33;
-pub const __WASI_EMLINK: u32 = 34;
-pub const __WASI_EMSGSIZE: u32 = 35;
-pub const __WASI_EMULTIHOP: u32 = 36;
-pub const __WASI_ENAMETOOLONG: u32 = 37;
-pub const __WASI_ENETDOWN: u32 = 38;
-pub const __WASI_ENETRESET: u32 = 39;
-pub const __WASI_ENETUNREACH: u32 = 40;
-pub const __WASI_ENFILE: u32 = 41;
-pub const __WASI_ENOBUFS: u32 = 42;
-pub const __WASI_ENODEV: u32 = 43;
-pub const __WASI_ENOENT: u32 = 44;
-pub const __WASI_ENOEXEC: u32 = 45;
-pub const __WASI_ENOLCK: u32 = 46;
-pub const __WASI_ENOLINK: u32 = 47;
-pub const __WASI_ENOMEM: u32 = 48;
-pub const __WASI_ENOMSG: u32 = 49;
-pub const __WASI_ENOPROTOOPT: u32 = 50;
-pub const __WASI_ENOSPC: u32 = 51;
-pub const __WASI_ENOSYS: u32 = 52;
-pub const __WASI_ENOTCONN: u32 = 53;
-pub const __WASI_ENOTDIR: u32 = 54;
-pub const __WASI_ENOTEMPTY: u32 = 55;
-pub const __WASI_ENOTRECOVERABLE: u32 = 56;
-pub const __WASI_ENOTSOCK: u32 = 57;
-pub const __WASI_ENOTSUP: u32 = 58;
-pub const __WASI_ENOTTY: u32 = 59;
-pub const __WASI_ENXIO: u32 = 60;
-pub const __WASI_EOVERFLOW: u32 = 61;
-pub const __WASI_EOWNERDEAD: u32 = 62;
-pub const __WASI_EPERM: u32 = 63;
-pub const __WASI_EPIPE: u32 = 64;
-pub const __WASI_EPROTO: u32 = 65;
-pub const __WASI_EPROTONOSUPPORT: u32 = 66;
-pub const __WASI_EPROTOTYPE: u32 = 67;
-pub const __WASI_ERANGE: u32 = 68;
-pub const __WASI_EROFS: u32 = 69;
-pub const __WASI_ESPIPE: u32 = 70;
-pub const __WASI_ESRCH: u32 = 71;
-pub const __WASI_ESTALE: u32 = 72;
-pub const __WASI_ETIMEDOUT: u32 = 73;
-pub const __WASI_ETXTBSY: u32 = 74;
-pub const __WASI_EXDEV: u32 = 75;
-pub const __WASI_ENOTCAPABLE: u32 = 76;
+pub type __wasi_errno_t = u16;
+pub const __WASI_ESUCCESS: u16 = 0;
+pub const __WASI_E2BIG: u16 = 1;
+pub const __WASI_EACCES: u16 = 2;
+pub const __WASI_EADDRINUSE: u16 = 3;
+pub const __WASI_EADDRNOTAVAIL: u16 = 4;
+pub const __WASI_EAFNOSUPPORT: u16 = 5;
+pub const __WASI_EAGAIN: u16 = 6;
+pub const __WASI_EALREADY: u16 = 7;
+pub const __WASI_EBADF: u16 = 8;
+pub const __WASI_EBADMSG: u16 = 9;
+pub const __WASI_EBUSY: u16 = 10;
+pub const __WASI_ECANCELED: u16 = 11;
+pub const __WASI_ECHILD: u16 = 12;
+pub const __WASI_ECONNABORTED: u16 = 13;
+pub const __WASI_ECONNREFUSED: u16 = 14;
+pub const __WASI_ECONNRESET: u16 = 15;
+pub const __WASI_EDEADLK: u16 = 16;
+pub const __WASI_EDESTADDRREQ: u16 = 17;
+pub const __WASI_EDOM: u16 = 18;
+pub const __WASI_EDQUOT: u16 = 19;
+pub const __WASI_EEXIST: u16 = 20;
+pub const __WASI_EFAULT: u16 = 21;
+pub const __WASI_EFBIG: u16 = 22;
+pub const __WASI_EHOSTUNREACH: u16 = 23;
+pub const __WASI_EIDRM: u16 = 24;
+pub const __WASI_EILSEQ: u16 = 25;
+pub const __WASI_EINPROGRESS: u16 = 26;
+pub const __WASI_EINTR: u16 = 27;
+pub const __WASI_EINVAL: u16 = 28;
+pub const __WASI_EIO: u16 = 29;
+pub const __WASI_EISCONN: u16 = 30;
+pub const __WASI_EISDIR: u16 = 31;
+pub const __WASI_ELOOP: u16 = 32;
+pub const __WASI_EMFILE: u16 = 33;
+pub const __WASI_EMLINK: u16 = 34;
+pub const __WASI_EMSGSIZE: u16 = 35;
+pub const __WASI_EMULTIHOP: u16 = 36;
+pub const __WASI_ENAMETOOLONG: u16 = 37;
+pub const __WASI_ENETDOWN: u16 = 38;
+pub const __WASI_ENETRESET: u16 = 39;
+pub const __WASI_ENETUNREACH: u16 = 40;
+pub const __WASI_ENFILE: u16 = 41;
+pub const __WASI_ENOBUFS: u16 = 42;
+pub const __WASI_ENODEV: u16 = 43;
+pub const __WASI_ENOENT: u16 = 44;
+pub const __WASI_ENOEXEC: u16 = 45;
+pub const __WASI_ENOLCK: u16 = 46;
+pub const __WASI_ENOLINK: u16 = 47;
+pub const __WASI_ENOMEM: u16 = 48;
+pub const __WASI_ENOMSG: u16 = 49;
+pub const __WASI_ENOPROTOOPT: u16 = 50;
+pub const __WASI_ENOSPC: u16 = 51;
+pub const __WASI_ENOSYS: u16 = 52;
+pub const __WASI_ENOTCONN: u16 = 53;
+pub const __WASI_ENOTDIR: u16 = 54;
+pub const __WASI_ENOTEMPTY: u16 = 55;
+pub const __WASI_ENOTRECOVERABLE: u16 = 56;
+pub const __WASI_ENOTSOCK: u16 = 57;
+pub const __WASI_ENOTSUP: u16 = 58;
+pub const __WASI_ENOTTY: u16 = 59;
+pub const __WASI_ENXIO: u16 = 60;
+pub const __WASI_EOVERFLOW: u16 = 61;
+pub const __WASI_EOWNERDEAD: u16 = 62;
+pub const __WASI_EPERM: u16 = 63;
+pub const __WASI_EPIPE: u16 = 64;
+pub const __WASI_EPROTO: u16 = 65;
+pub const __WASI_EPROTONOSUPPORT: u16 = 66;
+pub const __WASI_EPROTOTYPE: u16 = 67;
+pub const __WASI_ERANGE: u16 = 68;
+pub const __WASI_EROFS: u16 = 69;
+pub const __WASI_ESPIPE: u16 = 70;
+pub const __WASI_ESRCH: u16 = 71;
+pub const __WASI_ESTALE: u16 = 72;
+pub const __WASI_ETIMEDOUT: u16 = 73;
+pub const __WASI_ETXTBSY: u16 = 74;
+pub const __WASI_EXDEV: u16 = 75;
+pub const __WASI_ENOTCAPABLE: u16 = 76;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[repr(C)]

From 39ebca366cd5ce93a3904e6eeb426b303a9d37a2 Mon Sep 17 00:00:00 2001
From: Lachlan Sneff <lachlan.sneff@gmail.com>
Date: Mon, 22 Apr 2019 11:44:31 -0700
Subject: [PATCH 3/7] Update changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9284916aa..4a96a0999 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ All PRs to the Wasmer repository must add to this file.
 Blocks of changes will separated by version increments.
 
 ## **[Unreleased]**
+- [#379](https://github.com/wasmerio/wasmer/pull/379) Fix small return types from imported functions.
 - [#371](https://github.com/wasmerio/wasmer/pull/371) Add more Debug impl for WASI types
 - [#368](https://github.com/wasmerio/wasmer/pull/368) Fix issue with write buffering
 - [#343](https://github.com/wasmerio/wasmer/pull/343) Implement preopened files for WASI and fix aligment issue when accessing WASI memory

From ecdcab5de9c2f0a9140604458e33e99c0370a3b6 Mon Sep 17 00:00:00 2001
From: Lachlan Sneff <lachlan.sneff@gmail.com>
Date: Mon, 22 Apr 2019 11:47:47 -0700
Subject: [PATCH 4/7] Update singlepass to renamed enum discrimant

---
 lib/singlepass-backend/src/protect_unix.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/singlepass-backend/src/protect_unix.rs b/lib/singlepass-backend/src/protect_unix.rs
index 918df5346..30019db13 100644
--- a/lib/singlepass-backend/src/protect_unix.rs
+++ b/lib/singlepass-backend/src/protect_unix.rs
@@ -76,7 +76,7 @@ pub fn call_protected<T>(f: impl FnOnce() -> T) -> RuntimeResult<T> {
             *jmp_buf = prev_jmp_buf;
 
             if let Some(data) = TRAP_EARLY_DATA.with(|cell| cell.replace(None)) {
-                Err(RuntimeError::Panic { data })
+                Err(RuntimeError::Error { data })
             } else {
                 let (faulting_addr, _inst_ptr) = CAUGHT_ADDRESSES.with(|cell| cell.get());
 

From 7940aa7e426f2b7728c31ddb54cb8c94916df32b Mon Sep 17 00:00:00 2001
From: Lachlan Sneff <lachlan.sneff@gmail.com>
Date: Mon, 22 Apr 2019 11:57:50 -0700
Subject: [PATCH 5/7] Fix renamed variable

---
 lib/wasi/src/syscalls/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/wasi/src/syscalls/mod.rs b/lib/wasi/src/syscalls/mod.rs
index ba9d66b5d..ddbb0e517 100644
--- a/lib/wasi/src/syscalls/mod.rs
+++ b/lib/wasi/src/syscalls/mod.rs
@@ -1432,7 +1432,7 @@ pub fn poll_oneoff(
     unimplemented!()
 }
 pub fn proc_exit(ctx: &mut Ctx, code: __wasi_exitcode_t) -> Result<(), ExitCode> {
-    debug!("wasi::proc_exit, {}", rval);
+    debug!("wasi::proc_exit, {}", code);
     Err(ExitCode { code })
 }
 pub fn proc_raise(ctx: &mut Ctx, sig: __wasi_signal_t) -> __wasi_errno_t {

From 878a0e6687067ed26987c3d15d379ae495c9d43d Mon Sep 17 00:00:00 2001
From: Syrus <me@syrusakbary.com>
Date: Mon, 22 Apr 2019 12:09:30 -0700
Subject: [PATCH 6/7] =?UTF-8?q?Partial=20Revert=20of=20types=20=E2=80=9CRe?=
 =?UTF-8?q?turn=20type=20normalization,=20and=20change=20return=20errors?=
 =?UTF-8?q?=20from=20imported=20functions"?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This reverts commit 74b6ba4eaf307091e34c957ede66b1579e180378.

# Conflicts:
#	lib/wasi/src/syscalls/mod.rs
---
 lib/wasi/src/syscalls/types.rs | 156 ++++++++++++++++-----------------
 1 file changed, 78 insertions(+), 78 deletions(-)

diff --git a/lib/wasi/src/syscalls/types.rs b/lib/wasi/src/syscalls/types.rs
index c239031a4..c030df312 100644
--- a/lib/wasi/src/syscalls/types.rs
+++ b/lib/wasi/src/syscalls/types.rs
@@ -43,84 +43,84 @@ pub struct __wasi_dirent_t {
     pub d_type: __wasi_filetype_t,
 }
 
-pub type __wasi_errno_t = u16;
-pub const __WASI_ESUCCESS: u16 = 0;
-pub const __WASI_E2BIG: u16 = 1;
-pub const __WASI_EACCES: u16 = 2;
-pub const __WASI_EADDRINUSE: u16 = 3;
-pub const __WASI_EADDRNOTAVAIL: u16 = 4;
-pub const __WASI_EAFNOSUPPORT: u16 = 5;
-pub const __WASI_EAGAIN: u16 = 6;
-pub const __WASI_EALREADY: u16 = 7;
-pub const __WASI_EBADF: u16 = 8;
-pub const __WASI_EBADMSG: u16 = 9;
-pub const __WASI_EBUSY: u16 = 10;
-pub const __WASI_ECANCELED: u16 = 11;
-pub const __WASI_ECHILD: u16 = 12;
-pub const __WASI_ECONNABORTED: u16 = 13;
-pub const __WASI_ECONNREFUSED: u16 = 14;
-pub const __WASI_ECONNRESET: u16 = 15;
-pub const __WASI_EDEADLK: u16 = 16;
-pub const __WASI_EDESTADDRREQ: u16 = 17;
-pub const __WASI_EDOM: u16 = 18;
-pub const __WASI_EDQUOT: u16 = 19;
-pub const __WASI_EEXIST: u16 = 20;
-pub const __WASI_EFAULT: u16 = 21;
-pub const __WASI_EFBIG: u16 = 22;
-pub const __WASI_EHOSTUNREACH: u16 = 23;
-pub const __WASI_EIDRM: u16 = 24;
-pub const __WASI_EILSEQ: u16 = 25;
-pub const __WASI_EINPROGRESS: u16 = 26;
-pub const __WASI_EINTR: u16 = 27;
-pub const __WASI_EINVAL: u16 = 28;
-pub const __WASI_EIO: u16 = 29;
-pub const __WASI_EISCONN: u16 = 30;
-pub const __WASI_EISDIR: u16 = 31;
-pub const __WASI_ELOOP: u16 = 32;
-pub const __WASI_EMFILE: u16 = 33;
-pub const __WASI_EMLINK: u16 = 34;
-pub const __WASI_EMSGSIZE: u16 = 35;
-pub const __WASI_EMULTIHOP: u16 = 36;
-pub const __WASI_ENAMETOOLONG: u16 = 37;
-pub const __WASI_ENETDOWN: u16 = 38;
-pub const __WASI_ENETRESET: u16 = 39;
-pub const __WASI_ENETUNREACH: u16 = 40;
-pub const __WASI_ENFILE: u16 = 41;
-pub const __WASI_ENOBUFS: u16 = 42;
-pub const __WASI_ENODEV: u16 = 43;
-pub const __WASI_ENOENT: u16 = 44;
-pub const __WASI_ENOEXEC: u16 = 45;
-pub const __WASI_ENOLCK: u16 = 46;
-pub const __WASI_ENOLINK: u16 = 47;
-pub const __WASI_ENOMEM: u16 = 48;
-pub const __WASI_ENOMSG: u16 = 49;
-pub const __WASI_ENOPROTOOPT: u16 = 50;
-pub const __WASI_ENOSPC: u16 = 51;
-pub const __WASI_ENOSYS: u16 = 52;
-pub const __WASI_ENOTCONN: u16 = 53;
-pub const __WASI_ENOTDIR: u16 = 54;
-pub const __WASI_ENOTEMPTY: u16 = 55;
-pub const __WASI_ENOTRECOVERABLE: u16 = 56;
-pub const __WASI_ENOTSOCK: u16 = 57;
-pub const __WASI_ENOTSUP: u16 = 58;
-pub const __WASI_ENOTTY: u16 = 59;
-pub const __WASI_ENXIO: u16 = 60;
-pub const __WASI_EOVERFLOW: u16 = 61;
-pub const __WASI_EOWNERDEAD: u16 = 62;
-pub const __WASI_EPERM: u16 = 63;
-pub const __WASI_EPIPE: u16 = 64;
-pub const __WASI_EPROTO: u16 = 65;
-pub const __WASI_EPROTONOSUPPORT: u16 = 66;
-pub const __WASI_EPROTOTYPE: u16 = 67;
-pub const __WASI_ERANGE: u16 = 68;
-pub const __WASI_EROFS: u16 = 69;
-pub const __WASI_ESPIPE: u16 = 70;
-pub const __WASI_ESRCH: u16 = 71;
-pub const __WASI_ESTALE: u16 = 72;
-pub const __WASI_ETIMEDOUT: u16 = 73;
-pub const __WASI_ETXTBSY: u16 = 74;
-pub const __WASI_EXDEV: u16 = 75;
-pub const __WASI_ENOTCAPABLE: u16 = 76;
+pub type __wasi_errno_t = u32;
+pub const __WASI_ESUCCESS: u32 = 0;
+pub const __WASI_E2BIG: u32 = 1;
+pub const __WASI_EACCES: u32 = 2;
+pub const __WASI_EADDRINUSE: u32 = 3;
+pub const __WASI_EADDRNOTAVAIL: u32 = 4;
+pub const __WASI_EAFNOSUPPORT: u32 = 5;
+pub const __WASI_EAGAIN: u32 = 6;
+pub const __WASI_EALREADY: u32 = 7;
+pub const __WASI_EBADF: u32 = 8;
+pub const __WASI_EBADMSG: u32 = 9;
+pub const __WASI_EBUSY: u32 = 10;
+pub const __WASI_ECANCELED: u32 = 11;
+pub const __WASI_ECHILD: u32 = 12;
+pub const __WASI_ECONNABORTED: u32 = 13;
+pub const __WASI_ECONNREFUSED: u32 = 14;
+pub const __WASI_ECONNRESET: u32 = 15;
+pub const __WASI_EDEADLK: u32 = 16;
+pub const __WASI_EDESTADDRREQ: u32 = 17;
+pub const __WASI_EDOM: u32 = 18;
+pub const __WASI_EDQUOT: u32 = 19;
+pub const __WASI_EEXIST: u32 = 20;
+pub const __WASI_EFAULT: u32 = 21;
+pub const __WASI_EFBIG: u32 = 22;
+pub const __WASI_EHOSTUNREACH: u32 = 23;
+pub const __WASI_EIDRM: u32 = 24;
+pub const __WASI_EILSEQ: u32 = 25;
+pub const __WASI_EINPROGRESS: u32 = 26;
+pub const __WASI_EINTR: u32 = 27;
+pub const __WASI_EINVAL: u32 = 28;
+pub const __WASI_EIO: u32 = 29;
+pub const __WASI_EISCONN: u32 = 30;
+pub const __WASI_EISDIR: u32 = 31;
+pub const __WASI_ELOOP: u32 = 32;
+pub const __WASI_EMFILE: u32 = 33;
+pub const __WASI_EMLINK: u32 = 34;
+pub const __WASI_EMSGSIZE: u32 = 35;
+pub const __WASI_EMULTIHOP: u32 = 36;
+pub const __WASI_ENAMETOOLONG: u32 = 37;
+pub const __WASI_ENETDOWN: u32 = 38;
+pub const __WASI_ENETRESET: u32 = 39;
+pub const __WASI_ENETUNREACH: u32 = 40;
+pub const __WASI_ENFILE: u32 = 41;
+pub const __WASI_ENOBUFS: u32 = 42;
+pub const __WASI_ENODEV: u32 = 43;
+pub const __WASI_ENOENT: u32 = 44;
+pub const __WASI_ENOEXEC: u32 = 45;
+pub const __WASI_ENOLCK: u32 = 46;
+pub const __WASI_ENOLINK: u32 = 47;
+pub const __WASI_ENOMEM: u32 = 48;
+pub const __WASI_ENOMSG: u32 = 49;
+pub const __WASI_ENOPROTOOPT: u32 = 50;
+pub const __WASI_ENOSPC: u32 = 51;
+pub const __WASI_ENOSYS: u32 = 52;
+pub const __WASI_ENOTCONN: u32 = 53;
+pub const __WASI_ENOTDIR: u32 = 54;
+pub const __WASI_ENOTEMPTY: u32 = 55;
+pub const __WASI_ENOTRECOVERABLE: u32 = 56;
+pub const __WASI_ENOTSOCK: u32 = 57;
+pub const __WASI_ENOTSUP: u32 = 58;
+pub const __WASI_ENOTTY: u32 = 59;
+pub const __WASI_ENXIO: u32 = 60;
+pub const __WASI_EOVERFLOW: u32 = 61;
+pub const __WASI_EOWNERDEAD: u32 = 62;
+pub const __WASI_EPERM: u32 = 63;
+pub const __WASI_EPIPE: u32 = 64;
+pub const __WASI_EPROTO: u32 = 65;
+pub const __WASI_EPROTONOSUPPORT: u32 = 66;
+pub const __WASI_EPROTOTYPE: u32 = 67;
+pub const __WASI_ERANGE: u32 = 68;
+pub const __WASI_EROFS: u32 = 69;
+pub const __WASI_ESPIPE: u32 = 70;
+pub const __WASI_ESRCH: u32 = 71;
+pub const __WASI_ESTALE: u32 = 72;
+pub const __WASI_ETIMEDOUT: u32 = 73;
+pub const __WASI_ETXTBSY: u32 = 74;
+pub const __WASI_EXDEV: u32 = 75;
+pub const __WASI_ENOTCAPABLE: u32 = 76;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[repr(C)]

From 3729c4a8b8248b95f60815322cdd006c528220ca Mon Sep 17 00:00:00 2001
From: Syrus <me@syrusakbary.com>
Date: Mon, 22 Apr 2019 12:10:39 -0700
Subject: [PATCH 7/7] Revert "Merge #370"

This reverts commit 48a8391f5d199dfaf88fac7cc4eefa194a88c572, reversing
changes made to 363b46eca7f43ddaf35ee43e4816bc8c1db9b233.
---
 lib/wasi/src/syscalls/types.rs | 208 ++++++++++++++++-----------------
 1 file changed, 104 insertions(+), 104 deletions(-)

diff --git a/lib/wasi/src/syscalls/types.rs b/lib/wasi/src/syscalls/types.rs
index c030df312..636e1858e 100644
--- a/lib/wasi/src/syscalls/types.rs
+++ b/lib/wasi/src/syscalls/types.rs
@@ -43,84 +43,84 @@ pub struct __wasi_dirent_t {
     pub d_type: __wasi_filetype_t,
 }
 
-pub type __wasi_errno_t = u32;
-pub const __WASI_ESUCCESS: u32 = 0;
-pub const __WASI_E2BIG: u32 = 1;
-pub const __WASI_EACCES: u32 = 2;
-pub const __WASI_EADDRINUSE: u32 = 3;
-pub const __WASI_EADDRNOTAVAIL: u32 = 4;
-pub const __WASI_EAFNOSUPPORT: u32 = 5;
-pub const __WASI_EAGAIN: u32 = 6;
-pub const __WASI_EALREADY: u32 = 7;
-pub const __WASI_EBADF: u32 = 8;
-pub const __WASI_EBADMSG: u32 = 9;
-pub const __WASI_EBUSY: u32 = 10;
-pub const __WASI_ECANCELED: u32 = 11;
-pub const __WASI_ECHILD: u32 = 12;
-pub const __WASI_ECONNABORTED: u32 = 13;
-pub const __WASI_ECONNREFUSED: u32 = 14;
-pub const __WASI_ECONNRESET: u32 = 15;
-pub const __WASI_EDEADLK: u32 = 16;
-pub const __WASI_EDESTADDRREQ: u32 = 17;
-pub const __WASI_EDOM: u32 = 18;
-pub const __WASI_EDQUOT: u32 = 19;
-pub const __WASI_EEXIST: u32 = 20;
-pub const __WASI_EFAULT: u32 = 21;
-pub const __WASI_EFBIG: u32 = 22;
-pub const __WASI_EHOSTUNREACH: u32 = 23;
-pub const __WASI_EIDRM: u32 = 24;
-pub const __WASI_EILSEQ: u32 = 25;
-pub const __WASI_EINPROGRESS: u32 = 26;
-pub const __WASI_EINTR: u32 = 27;
-pub const __WASI_EINVAL: u32 = 28;
-pub const __WASI_EIO: u32 = 29;
-pub const __WASI_EISCONN: u32 = 30;
-pub const __WASI_EISDIR: u32 = 31;
-pub const __WASI_ELOOP: u32 = 32;
-pub const __WASI_EMFILE: u32 = 33;
-pub const __WASI_EMLINK: u32 = 34;
-pub const __WASI_EMSGSIZE: u32 = 35;
-pub const __WASI_EMULTIHOP: u32 = 36;
-pub const __WASI_ENAMETOOLONG: u32 = 37;
-pub const __WASI_ENETDOWN: u32 = 38;
-pub const __WASI_ENETRESET: u32 = 39;
-pub const __WASI_ENETUNREACH: u32 = 40;
-pub const __WASI_ENFILE: u32 = 41;
-pub const __WASI_ENOBUFS: u32 = 42;
-pub const __WASI_ENODEV: u32 = 43;
-pub const __WASI_ENOENT: u32 = 44;
-pub const __WASI_ENOEXEC: u32 = 45;
-pub const __WASI_ENOLCK: u32 = 46;
-pub const __WASI_ENOLINK: u32 = 47;
-pub const __WASI_ENOMEM: u32 = 48;
-pub const __WASI_ENOMSG: u32 = 49;
-pub const __WASI_ENOPROTOOPT: u32 = 50;
-pub const __WASI_ENOSPC: u32 = 51;
-pub const __WASI_ENOSYS: u32 = 52;
-pub const __WASI_ENOTCONN: u32 = 53;
-pub const __WASI_ENOTDIR: u32 = 54;
-pub const __WASI_ENOTEMPTY: u32 = 55;
-pub const __WASI_ENOTRECOVERABLE: u32 = 56;
-pub const __WASI_ENOTSOCK: u32 = 57;
-pub const __WASI_ENOTSUP: u32 = 58;
-pub const __WASI_ENOTTY: u32 = 59;
-pub const __WASI_ENXIO: u32 = 60;
-pub const __WASI_EOVERFLOW: u32 = 61;
-pub const __WASI_EOWNERDEAD: u32 = 62;
-pub const __WASI_EPERM: u32 = 63;
-pub const __WASI_EPIPE: u32 = 64;
-pub const __WASI_EPROTO: u32 = 65;
-pub const __WASI_EPROTONOSUPPORT: u32 = 66;
-pub const __WASI_EPROTOTYPE: u32 = 67;
-pub const __WASI_ERANGE: u32 = 68;
-pub const __WASI_EROFS: u32 = 69;
-pub const __WASI_ESPIPE: u32 = 70;
-pub const __WASI_ESRCH: u32 = 71;
-pub const __WASI_ESTALE: u32 = 72;
-pub const __WASI_ETIMEDOUT: u32 = 73;
-pub const __WASI_ETXTBSY: u32 = 74;
-pub const __WASI_EXDEV: u32 = 75;
-pub const __WASI_ENOTCAPABLE: u32 = 76;
+pub type __wasi_errno_t = u16;
+pub const __WASI_ESUCCESS: u16 = 0;
+pub const __WASI_E2BIG: u16 = 1;
+pub const __WASI_EACCES: u16 = 2;
+pub const __WASI_EADDRINUSE: u16 = 3;
+pub const __WASI_EADDRNOTAVAIL: u16 = 4;
+pub const __WASI_EAFNOSUPPORT: u16 = 5;
+pub const __WASI_EAGAIN: u16 = 6;
+pub const __WASI_EALREADY: u16 = 7;
+pub const __WASI_EBADF: u16 = 8;
+pub const __WASI_EBADMSG: u16 = 9;
+pub const __WASI_EBUSY: u16 = 10;
+pub const __WASI_ECANCELED: u16 = 11;
+pub const __WASI_ECHILD: u16 = 12;
+pub const __WASI_ECONNABORTED: u16 = 13;
+pub const __WASI_ECONNREFUSED: u16 = 14;
+pub const __WASI_ECONNRESET: u16 = 15;
+pub const __WASI_EDEADLK: u16 = 16;
+pub const __WASI_EDESTADDRREQ: u16 = 17;
+pub const __WASI_EDOM: u16 = 18;
+pub const __WASI_EDQUOT: u16 = 19;
+pub const __WASI_EEXIST: u16 = 20;
+pub const __WASI_EFAULT: u16 = 21;
+pub const __WASI_EFBIG: u16 = 22;
+pub const __WASI_EHOSTUNREACH: u16 = 23;
+pub const __WASI_EIDRM: u16 = 24;
+pub const __WASI_EILSEQ: u16 = 25;
+pub const __WASI_EINPROGRESS: u16 = 26;
+pub const __WASI_EINTR: u16 = 27;
+pub const __WASI_EINVAL: u16 = 28;
+pub const __WASI_EIO: u16 = 29;
+pub const __WASI_EISCONN: u16 = 30;
+pub const __WASI_EISDIR: u16 = 31;
+pub const __WASI_ELOOP: u16 = 32;
+pub const __WASI_EMFILE: u16 = 33;
+pub const __WASI_EMLINK: u16 = 34;
+pub const __WASI_EMSGSIZE: u16 = 35;
+pub const __WASI_EMULTIHOP: u16 = 36;
+pub const __WASI_ENAMETOOLONG: u16 = 37;
+pub const __WASI_ENETDOWN: u16 = 38;
+pub const __WASI_ENETRESET: u16 = 39;
+pub const __WASI_ENETUNREACH: u16 = 40;
+pub const __WASI_ENFILE: u16 = 41;
+pub const __WASI_ENOBUFS: u16 = 42;
+pub const __WASI_ENODEV: u16 = 43;
+pub const __WASI_ENOENT: u16 = 44;
+pub const __WASI_ENOEXEC: u16 = 45;
+pub const __WASI_ENOLCK: u16 = 46;
+pub const __WASI_ENOLINK: u16 = 47;
+pub const __WASI_ENOMEM: u16 = 48;
+pub const __WASI_ENOMSG: u16 = 49;
+pub const __WASI_ENOPROTOOPT: u16 = 50;
+pub const __WASI_ENOSPC: u16 = 51;
+pub const __WASI_ENOSYS: u16 = 52;
+pub const __WASI_ENOTCONN: u16 = 53;
+pub const __WASI_ENOTDIR: u16 = 54;
+pub const __WASI_ENOTEMPTY: u16 = 55;
+pub const __WASI_ENOTRECOVERABLE: u16 = 56;
+pub const __WASI_ENOTSOCK: u16 = 57;
+pub const __WASI_ENOTSUP: u16 = 58;
+pub const __WASI_ENOTTY: u16 = 59;
+pub const __WASI_ENXIO: u16 = 60;
+pub const __WASI_EOVERFLOW: u16 = 61;
+pub const __WASI_EOWNERDEAD: u16 = 62;
+pub const __WASI_EPERM: u16 = 63;
+pub const __WASI_EPIPE: u16 = 64;
+pub const __WASI_EPROTO: u16 = 65;
+pub const __WASI_EPROTONOSUPPORT: u16 = 66;
+pub const __WASI_EPROTOTYPE: u16 = 67;
+pub const __WASI_ERANGE: u16 = 68;
+pub const __WASI_EROFS: u16 = 69;
+pub const __WASI_ESPIPE: u16 = 70;
+pub const __WASI_ESRCH: u16 = 71;
+pub const __WASI_ESTALE: u16 = 72;
+pub const __WASI_ETIMEDOUT: u16 = 73;
+pub const __WASI_ETXTBSY: u16 = 74;
+pub const __WASI_EXDEV: u16 = 75;
+pub const __WASI_ENOTCAPABLE: u16 = 76;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[repr(C)]
@@ -174,8 +174,8 @@ impl __wasi_event_t {
     }
 }
 
-pub type __wasi_eventrwflags_t = u32;
-pub const __WASI_EVENT_FD_READWRITE_HANGUP: u32 = 1 << 0;
+pub type __wasi_eventrwflags_t = u16;
+pub const __WASI_EVENT_FD_READWRITE_HANGUP: u16 = 1 << 0;
 
 pub type __wasi_eventtype_t = u8;
 pub const __WASI_EVENTTYPE_CLOCK: u8 = 0;
@@ -189,12 +189,12 @@ pub const __WASI_STDIN_FILENO: u32 = 0;
 pub const __WASI_STDOUT_FILENO: u32 = 1;
 pub const __WASI_STDERR_FILENO: u32 = 2;
 
-pub type __wasi_fdflags_t = u32;
-pub const __WASI_FDFLAG_APPEND: u32 = 1 << 0;
-pub const __WASI_FDFLAG_DSYNC: u32 = 1 << 1;
-pub const __WASI_FDFLAG_NONBLOCK: u32 = 1 << 2;
-pub const __WASI_FDFLAG_RSYNC: u32 = 1 << 3;
-pub const __WASI_FDFLAG_SYNC: u32 = 1 << 4;
+pub type __wasi_fdflags_t = u16;
+pub const __WASI_FDFLAG_APPEND: u16 = 1 << 0;
+pub const __WASI_FDFLAG_DSYNC: u16 = 1 << 1;
+pub const __WASI_FDFLAG_NONBLOCK: u16 = 1 << 2;
+pub const __WASI_FDFLAG_RSYNC: u16 = 1 << 3;
+pub const __WASI_FDFLAG_SYNC: u16 = 1 << 4;
 
 pub type __wasi_preopentype_t = u8;
 pub const __WASI_PREOPENTYPE_DIR: u8 = 0;
@@ -296,11 +296,11 @@ pub const __WASI_FILETYPE_SOCKET_DGRAM: u8 = 5;
 pub const __WASI_FILETYPE_SOCKET_STREAM: u8 = 6;
 pub const __WASI_FILETYPE_SYMBOLIC_LINK: u8 = 7;
 
-pub type __wasi_fstflags_t = u32;
-pub const __WASI_FILESTAT_SET_ATIM: u32 = 1 << 0;
-pub const __WASI_FILESTAT_SET_ATIM_NOW: u32 = 1 << 1;
-pub const __WASI_FILESTAT_SET_MTIM: u32 = 1 << 2;
-pub const __WASI_FILESTAT_SET_MTIM_NOW: u32 = 1 << 3;
+pub type __wasi_fstflags_t = u16;
+pub const __WASI_FILESTAT_SET_ATIM: u16 = 1 << 0;
+pub const __WASI_FILESTAT_SET_ATIM_NOW: u16 = 1 << 1;
+pub const __WASI_FILESTAT_SET_MTIM: u16 = 1 << 2;
+pub const __WASI_FILESTAT_SET_MTIM_NOW: u16 = 1 << 3;
 
 pub type __wasi_inode_t = u64;
 
@@ -318,15 +318,15 @@ pub type __wasi_linkcount_t = u32;
 pub type __wasi_lookupflags_t = u32;
 pub const __WASI_LOOKUP_SYMLINK_FOLLOW: u32 = 1 << 0;
 
-pub type __wasi_oflags_t = u32;
-pub const __WASI_O_CREAT: u32 = 1 << 0;
-pub const __WASI_O_DIRECTORY: u32 = 1 << 1;
-pub const __WASI_O_EXCL: u32 = 1 << 2;
-pub const __WASI_O_TRUNC: u32 = 1 << 3;
+pub type __wasi_oflags_t = u16;
+pub const __WASI_O_CREAT: u16 = 1 << 0;
+pub const __WASI_O_DIRECTORY: u16 = 1 << 1;
+pub const __WASI_O_EXCL: u16 = 1 << 2;
+pub const __WASI_O_TRUNC: u16 = 1 << 3;
 
-pub type __wasi_riflags_t = u32;
-pub const __WASI_SOCK_RECV_PEEK: u32 = 1 << 0;
-pub const __WASI_SOCK_RECV_WAITALL: u32 = 1 << 1;
+pub type __wasi_riflags_t = u16;
+pub const __WASI_SOCK_RECV_PEEK: u16 = 1 << 0;
+pub const __WASI_SOCK_RECV_WAITALL: u16 = 1 << 1;
 
 pub type __wasi_rights_t = u64;
 pub const __WASI_RIGHT_FD_DATASYNC: u64 = 1 << 0;
@@ -359,14 +359,14 @@ pub const __WASI_RIGHT_PATH_REMOVE_DIRECTORY: u64 = 1 << 26;
 pub const __WASI_RIGHT_POLL_FD_READWRITE: u64 = 1 << 27;
 pub const __WASI_RIGHT_SOCK_SHUTDOWN: u64 = 1 << 28;
 
-pub type __wasi_roflags_t = u32;
-pub const __WASI_SOCK_RECV_DATA_TRUNCATED: u32 = 1 << 0;
+pub type __wasi_roflags_t = u16;
+pub const __WASI_SOCK_RECV_DATA_TRUNCATED: u16 = 1 << 0;
 
 pub type __wasi_sdflags_t = u8;
 pub const __WASI_SHUT_RD: u8 = 1 << 0;
 pub const __WASI_SHUT_WR: u8 = 1 << 1;
 
-pub type __wasi_siflags_t = u32;
+pub type __wasi_siflags_t = u16;
 
 pub type __wasi_signal_t = u8;
 pub const __WASI_SIGABRT: u8 = 0;
@@ -396,8 +396,8 @@ pub const __WASI_SIGVTALRM: u8 = 23;
 pub const __WASI_SIGXCPU: u8 = 24;
 pub const __WASI_SIGXFSZ: u8 = 25;
 
-pub type __wasi_subclockflags_t = u32;
-pub const __WASI_SUBSCRIPTION_CLOCK_ABSTIME: u32 = 1 << 0;
+pub type __wasi_subclockflags_t = u16;
+pub const __WASI_SUBSCRIPTION_CLOCK_ABSTIME: u16 = 1 << 0;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[repr(C)]